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How to update a value with substring of current value by removing the separator and numbers after a separator in MySQL?
Here, let’s say you have a string with form “StringSeparatorNumber” form like John/56989. Now if you want to remove the number after separator /, then use the SUBSTRING_INDEX(). Let us first create a table −
mysql> create table DemoTable ( StudentName varchar(100) ); Query OK, 0 rows affected (1.05 sec)
Insert some records in the table using insert command −
mysql> insert into DemoTable values('John/56989');
Query OK, 1 row affected (0.12 sec)
mysql> insert into DemoTable values('Carol');
Query OK, 1 row affected (0.21 sec)
mysql> insert into DemoTable values('David/74674');
Query OK, 1 row affected (0.09 sec)
mysql> insert into DemoTable values('Bob/45565');
Query OK, 1 row affected (0.09 sec)Display all records from the table using select statement −
mysql> select *from DemoTable;
This will produce the following output −
+-------------+ | StudentName | +-------------+ | John/56989 | | Carol | | David/74674 | | Bob/45565 | +-------------+ 4 rows in set (0.00 sec)
Following is the query to update a value with substring of current value −
mysql> update DemoTable set StudentName=substring_index(StudentName,'/',1); Query OK, 3 rows affected (0.13 sec) Rows matched :4 Changed :3 Warnings :0
Let us check the table records once again −
mysql> select *from DemoTable;
This will produce the following output −
+-------------+ | StudentName | +-------------+ | John | | Carol | | David | | Bob | +-------------+ 4 rows in set (0.00 sec)
Updated on: 10-Oct-2019
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